Keystones — Capstone
Five GCSE retrieval questions · 15 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √245
Answer: 7√5 -
2. Algebra Completing the square
Complete the square: 2x² + 8x + 12
Answer: 2(x + 2)² + 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 28cm, angle = 53°. Give your answer to 2 decimal places
Answer: 313.07cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 63:56:72 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 20, 42, 59, 15, 18, 26, 29, 93. Give your answer to 2 decimal places
Answer: Mean = 44.33, Median = 29, Range = 82